Frost history / Nws Boston/Norton, MA
Nws Boston/Norton, MA: frost dates by year
Last spring and first fall frost at NOAA station USC00198368, 1994 to 2025, measured from daily minimum temperatures.
Elevation 85 ft, 41.956, -71.139. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 27 | Oct 17 |
| Earliest | Apr 4 (2017) | Sep 30 (2000) |
| Latest | May 18 (2023) | Nov 9 (2017) |
| Trend | 3.3 days earlier per decade | 5.6 days later per decade |
| Years with data | 30 | 32 |
At 28°F (hard freeze) the median last spring date is Apr 10 and the median first fall date is Nov 2.
The trend is a straight-line fit through the years with a freeze. A positive spring trend means the last frost now comes later. Short or patchy records give noisy trends.
Chart
Last spring frost (32°F)
First fall frost (32°F)
Dots are single years. The gray line is the median, the green line the fitted trend.
Year by year
| Year | Last spring 32°F | First fall 32°F | Last spring 28°F | First fall 28°F |
|---|---|---|---|---|
| 2025 | Apr 19 | Oct 10 | Apr 12 | Nov 7 |
| 2024 | Apr 27 | Oct 17 | Mar 25 | Nov 4 |
| 2023 | May 18 | Nov 2 | Apr 11 | Nov 2 |
| 2022 | Apr 21 | Oct 30 | Apr 18 | Nov 15 |
| 2021 | Apr 22 | Nov 4 | Apr 5 | Nov 6 |
| 2020 | Apr 29 | Oct 18 | Apr 23 | Oct 31 |
| 2019 | Apr 6 | Oct 5 | Apr 5 | Nov 2 |
| 2018 | no data | Oct 19 | no data | Oct 22 |
| 2017 | Apr 4 | Nov 9 | Mar 27 | Nov 9 |
| 2016 | Apr 27 | Oct 27 | Apr 9 | Nov 5 |
| 2015 | Apr 25 | Oct 18 | Apr 3 | Oct 19 |
| 2014 | Apr 21 | Oct 20 | Apr 18 | Nov 15 |
| 2013 | Apr 22 | Oct 26 | Apr 8 | Oct 26 |
| 2012 | Apr 30 | Oct 13 | Apr 6 | Nov 6 |
| 2011 | Apr 22 | Oct 28 | Apr 9 | Oct 30 |
| 2010 | Apr 28 | Oct 23 | Mar 28 | Nov 2 |
| 2009 | Apr 17 | Oct 14 | Apr 9 | Nov 7 |
| 2008 | May 1 | Oct 21 | Apr 16 | Oct 23 |
| 2007 | May 7 | Oct 29 | Apr 11 | Oct 29 |
| 2006 | Apr 29 | Oct 14 | Apr 10 | Nov 4 |
| 2005 | Apr 22 | Oct 29 | Apr 17 | Nov 11 |
| 2004 | Apr 17 | Oct 6 | Mar 24 | Nov 4 |
| 2003 | May 18 | Oct 6 | Apr 25 | Oct 20 |
| 2002 | Apr 27 | Oct 15 | Apr 7 | Oct 22 |
| 2001 | May 7 | Oct 8 | May 7 | Oct 19 |
| 2000 | May 1 | Sep 30 | Apr 13 | Nov 19 |
| 1999 | May 1 | Oct 7 | Apr 11 | Nov 8 |
| 1998 | Apr 14 | Oct 7 | Apr 12 | Nov 3 |
| 1997 | Apr 27 | Oct 12 | Apr 15 | Oct 22 |
| 1996 | May 14 | Oct 4 | Apr 9 | Oct 12 |
| 1995 | May 2 | Oct 18 | Apr 10 | Nov 5 |
| 1994 | no data | Oct 12 | no data | Oct 28 |
"none" means the station recorded no freeze at that threshold in that half of the year. "no data" means more than 10% of the season's daily readings were missing. Years with no usable data are left out. See the methodology for the rules, and the ZIP lookup for 1991 to 2020 frost probabilities.